Method of manufacturing knitted material with catalytic properties

FIELD: waste water and gas emission treatment.

SUBSTANCE: invention relates to methods for preparing catalytic materials to clean waste waters and gas emissions via removal of organic and inorganic components by liquid-phase oxidation process. Method comprises consecutive treatment of knitted cloth with hot alkali solution containing 14-42 g/L hydroxylamine chloride and an aqueous solution of variable-valence metal salts. In the first stage, treatment is carried out with modifying hydroxylamine chloride and ethylenediamine-containing solution wherein molar ratio of polyacrylonitrile unit number to ethylenediamine ranges from 2 to 10 and solution pH is 6-9. Treatment temperature is 95-105°C and treatment time 1-1.6 h. In the second stage, treatment with aqueous solution of variable-valence metal salts is carried out for 0.5 to 2 h.

EFFECT: simplified manufacture technology, reduced expenses on reagents, and reduced process time without loss in the firmness of fixation of variable-valence metal salts on cloth.

2 tbl, 21 ex

 

The invention relates to methods for catalytic materials for wastewater and gas emissions from organic and inorganic components by the method of liquid-phase oxidation.

Known catalysts for liquid-phase oxidation of pollutants, as a rule, are of various soluble compounds of metals of variable [Former J.V. Cleaning gas from the sulfur compounds. M niitekhim (Review), 1976, 31 S.]. Making these toxic and expensive compounds in the waste water is disadvantageous because there is no way their back-pull-out. The use of solid heterogeneous catalysts (e.g., granulated), which can be extracted from wastewater is disadvantageous for the following reasons. The speed of reactions involving heterogeneous processes is limited by diffusion of the components inside the granules. Therefore, the reactions take place at a low speed.

The solution to this problem may be the use of fibrous forms of the catalysts. Fibers have high external surface, easily accessible to reagents, strong, durable, can be processed using textile techniques and technologies in diverse, easy to use form.

Closest to the claimed solution is a method for textile volume of the fibrous catalyst [(prototype) Pat. Of the Russian Federation No. 2145653, Theres the NGOs L.Y., Linford R., Vitkovskaya Russia, having got, Dahmas R., Hedderman CD, Ishchenko V. the Method of obtaining textile volume of catalyst. Publ. Bull. izopet. No. 5 of 2000]. The method consists of two-stage processing of knitted fabric consisting of a solid, inert monofilaments of polypropylene, giving the material a three-dimensional form and filament yarn of polyacrylonitrile (PAN). In the first stage of the PAN threads impart ion exchange and complexing properties by treatment with a hot aqueous solution containing hydrochloric acid hydrazine in the number of 5-9 g/l, hydrochloric acid hydroxylamine in the amount of 7 to 14 g/l, sodium carbonate, in the amount required for complete neutralization entered salts of hydrazine or of hydroxylamine, sodium hydroxide in an amount necessary to create a pH of 9-11, the sodium nitrite in the amount of 10-20 g/l, the solution temperature is 101-105°C, the processing time of 1.6-2.0 hours with further processing of the aqueous solution of sodium hydroxide with a concentration of 50-100 g/l at a temperature 101-105°and processing time of 0.5 to 15 minutes At the second stage, the canvas is treated with an aqueous solution of salt of a metal of variable valence within 24-36 hours. The metal connects with complexing groups that appeared in polyacrylonitrile fiber as a result of processing, which leads to the formation of material about daysago catalytic properties. The use of compounds of hydrazine leads to intermolecular crosslinking chains of polyacrylonitrile with a sharp increase chemical resistance of the fiber. And the use of salts of hydroxylamine leads to the formation on the fiber amidoxime groups, in which process conditions hydrolyzed to hydroxymelatonin, cyclists education glucosomine and other cycles. Conditions modifications in the prototype is chosen so as to maximize the strength of the fixing metal of variable valence on the fiber (and, hence, increase the service life of the catalyst) and high catalytic activity. In particular for this purpose in modifying the solution, in addition to the compounds of hydrazine or of hydroxylamine, introduced sodium nitrite.

Durable frame made of polypropylene yarn gives the material a stable three-dimensional form, providing an intense hydrodynamic regime and, accordingly, intensive contact in the system liquid - air - catalyst in the process of liquid-phase oxidation.

The main disadvantages of the prototype are given the complexity of the technological scheme of the synthesis, the necessity of using a large number of expensive and toxic reagents, the complexity of the system to maintain a specified rather narrow temperature interval, large total time of the process. Another is dostatkom is the high alkalinity of the modifying solution. Because the solution contains highly toxic nitrogenous bases - hydrazine and hydroxylamine, with the increase of pH they can stand out from the solution in a free form in the environment. In addition, at high pH values their small stability at elevated temperatures and they are prone to destruction. All this results in the unnecessary loss of these reagents. High pH values associated with the need of nitrile hydrolysis and amidoxime groups with the formation of complexing compounds able to hold the metal of variable valence in its composition. From the authors of the technological scheme of receipt of the prototype follows that even when the maximum pH values (11) hydrolysis in the process of conducting alkali-hydrazine powered processing does not proceed to the end. Therefore requires additional processing solution of sodium hydroxide at elevated temperatures. Without this treatment the material does not adsorb metal ions of variable valence and cannot therefore be used as a catalyst.

The technical result of the invention is the simplification of the manufacture of the catalyst by eliminating additional processing aqueous solution of sodium hydroxide, reducing the cost of reagents, reducing the time to manufacture while maintaining the catalytic properties of the floor of the obtained catalyst and the strength of the fixing metal of variable valence on the fiber.

This object is achieved in that in a method of producing knitted material with catalytic properties, consisting of monofilaments and complex polyacrylonitrile filaments, which consists in the sequential processing of knitted fabric with a hot alkaline solution containing chloride hydroxylamine in the number 14-42 g/l and an aqueous solution of salts of metals of variable valency, characterized in that in the first stage, spend processing the modifying solution containing chloride hydroxylamine and Ethylenediamine, in which the ratio of the number of parts of polyacrylonitrile to the amount of Ethylenediamine is 2-10, the solution pH is 6-9, temperature processing 95-105°C, the processing time 1-1,6 hours and in the second stage are processed in an aqueous solution of transition metal salts for 0.5 - 2 hours.

In the prior art known to use hot hydrazine-hydroxylamine-alkaline processing for modification of POLYACRYLONITRILE fibres in order to give them anion-exchange and complexing properties, the closest analogue is the material "Bulana AG [Kulinskaya D.A. study of the process of modification of POLYACRYLONITRILE fibres "Bulan" (HP Bulgaria) in order to give them ion exchange and complexing properties. Diss. on Soskin L., 1976. S-83]. Conditions for modification the following:

concentration g/l
NH2OH×HCl42
N2H4×2HCl10
Na2CO339
temperature90°
processing time1 hour
the ratio of the mass of solution mass
loaded PAN50 kg of solution/kg
fiber module (baths)fiber
pH modifying solution6.3-6.5

This material was designed as an ion exchanger, conditions modifications in contrast of the invention is selected so as to hinder hydrolysis of the resulting amidoxime groups, and sorption of metal ions of variable valence on such material is reversible and secure the strength so small and, therefore, the use of this material as a catalyst impossible, because of the possibility of separation of the metal in solution in the process of catalysis, which will cause the weakening of the catalytic properties of the material.

The essential features are that in the first stage, carry out the processing of modifying the solution containing the hydroxy chloride is Amina and Ethylenediamine, in which the ratio of the number of parts of polyacrylonitrile to the amount of Ethylenediamine is 2-10, the solution pH is 6-9, temperature processing 95-105°C, the processing time 1-1,6 hours, and the second stage are processed in an aqueous solution of transition metal salts for 0.5-2 hours.

The authors experimentally found that the replacement of sodium hydroxide Ethylenediamine as softer gidrolizuut agent allows to obtain more simple technology of the synthesis catalyst. Since the hydrolysis of the nitrile and other groups proceeds under milder conditions, it eliminates the use of toxic and expensive compounds of hydrazine. In the prototype, the salt of the hydrazine was used for crosslinking of macromolecules polyacrylonitrile. Without such cross-linking in the presence of alkali is the complete destruction of the fibrous structure of polyacrylonitrile. When using a milder reagent - Ethylenediamine hydrolysis process does not reach the destruction of the fibrous structure and without additional crosslinks. When this modified fibers are more swollen condition compared to the prototype. Increases the porosity and the availability of reagents to the surface of macromolecules. Further interaction with metal ions of variable valence extremely easier, does not require additional is Naya processing stage fiber hot concentrated solution of sodium hydroxide. In addition, the processing time solution of transition metals, necessary for the interaction of metal ions with complexing groups of fibers is significantly reduced, which reduces the total time of synthesis of the catalyst (see table 1). When more soft carrying out hydrolysis can be achieved increasing the number of complexing groups on the fiber. This is because part of the nitrile groups, in which the prototype was spent on the formation of intermolecular crosslinks, now also involved in the complexation. This increases the strength of the fixing metal on the fiber and eliminates additional modifying reagents in the solution of the carbonate and sodium nitrite.

The manufacturing process consists in the following. At the first stage of processing textile fabric, for example, associated method "poluting" type equipment, containing in its composition an inert solid Foundation, for example, from polypropylene filaments (TU-6-06-537-86) and PAN complex thread (for example, on the EAST 6-06-2-80), the ratio of the mass of the monofilaments of the carrier to the weight of POLYACRYLONITRILE filament yarn 60,7-82,3%, the linear density of the PAN threads 32/2-32/4 Tex, surface module loop 3,17-3,35, the total linear density of warp and weft threads 156, 3mm - 211,7 Tex, immersed in an autoclave containing an aqueous solution of salt of hydroxylamine and Ethylenediamine, conc the Oia chloride hydroxylamine should be 14-42 g/l, the ratio of the number of parts of polyacrylonitrile to the amount of ethylene diamine should be 2-10, the pH of the solution by means of sodium hydroxide should be brought to 6-9. The canvas at a given temperature (95-105° (C) stand for 1-1,6 hours, then pull out and washed with demineralized water. In the second stage, the cloth is dipped in an aqueous solution of a salt of a metal of variable valence, for example, concentration of metal ion 1-5% and held there for 0.5-2 hours, after washing demineralized water and drying in the drying chambers or drums at a temperature of not higher than 120°the catalyst is ready for use.

As the parameter characterizing the catalytic activity of the material was selected degree of conversion of oxidizable substances for a certain time of the reaction. As the characteristic strength of the fixing metal on the fiber (and, consequently, the stability of the catalyst over a long period of time) was selected degree of metal extraction in the processing of acidic buffer solution composition: 0.04 M H3PO4, 0.04 N CH3COOH, 0.04 N HBO2*H2O, X NaOH, pH 2, the processing time 160-170 hours. The higher the degree of extraction of the metal, the less secure the strength of the metal on the catalyst.

Examples.

Example 1

At the first stage of processing tekstilnoto, for example, an associated method "poluting" type equipment, containing in its composition an inert solid basis, for example from polypropylene filaments (TU-6-06-537-86) and PAN complex thread (for example, on the EAST 6-06-2-80), the ratio of the mass of the monofilaments of the carrier to the weight of POLYACRYLONITRILE filament yarn 70%, the linear density of the PAN threads 32/3 Tex, surface module loop 3,20, the total linear density of warp and weft threads 180 Tex, immersed in an autoclave containing an aqueous solution of hydroxylamine salt and Ethylenediamine, the concentration of chloride hydroxylamine should be 14 g/l, the ratio of the number of links polyacrylonitrile to the amount of ethylene diamine must be 2, the pH of the solution by means of sodium hydroxide should be increased to 6. The canvas at a given temperature (95° (C) incubated for 1 hour, then pull out and washed with demineralized water. In the second stage, the cloth is dipped in an aqueous solution of a salt of a metal of variable valence, for example, concentration of metal ion, for example, 5% and held there for 0.5 hours, after washing demineralized water and drying in the drying chambers or drums at a temperature of not higher than 120°the catalyst is ready for use. In table 2 (row 1) shows the test results of the obtained catalyst in the reaction liquid-phase oxidation of sodium sulfide with oxygen in the air. As the e of the metal of variable valence was selected divalent Nickel. The degree of removal of Nickel acidic buffer solution amounted to 0.29 (see Table 2, line 17 (prototype)), this indicates that secure the strength of metal on the fiber is not less than the prototype. The degree of conversion of sulfide sulfur amounted to 99.1%, which is not less than the prototype.

Examples 1-3

demonstrate the influence of the relations of quantities PAN/Ethylenediamine on the technical characteristics of the catalyst. Decrease this value below 2 decreases the catalytic activity to a level below the prototype. The increase above 10 leads to the decrease of catalytic activity and durability of fastening of metal to below the prototype.

Examples 4-6

Demonstrate the effect of pH on the characteristics of the catalyst. The decrease in pH below 6 impractical because of the resulting decrease of catalytic activity to a level below the prototype. Increasing the pH above 9 does not lead to further increase in catalytic activity and durability of fastening of metal on the fiber.

Examples 7-9

Demonstrate the effect of temperature hydroxylamino processing characteristics of the catalyst. The reduction of temperature below 95°impractical because of the resulting decrease of catalytic activity to a level below the prototype. Increases above 105°With, is impractical because it leads to a decrease in strength and fixing of metal on the fiber to have the anti-shudder performance, below is a prototype.

Examples 10-12

Demonstrate the influence of time hydroxylamino processing parameters of the catalyst. Reducing the processing time less than 1 hour is impractical because it leads to the decrease of catalytic activity and durability of fastening of metal on the fiber below the prototype. The increase above 1.6 hours does not lead to further increase in catalytic activity and durability of fastening of metal on the fiber.

Examples 13-15

Demonstrate the effect of time of treatment with a solution of salt of metal of variable valence parameters of the catalyst. The reduction time is less than 0.5 hours is impractical because it leads to loss of catalytic activity to a level below the prototype. The increase in processing time above 2 does not lead to a further increase of catalytic activity.

Example 16

Demonstrates the use of Dacron monofilament instead of the polypropylene used in all other examples.

Example 17 (prototype)

Demonstrates the features of the prototype needed for comparison with examples 1-15.

Examples 18-21

demonstrate the impact of metals of variable valence parameters of the catalyst in the oxidation of the dye acid blue 45" oxygen.

Examples 22-24 (prototype)

demonstrate the characteristics of the prototype in the same reaction, to compare the texts with examples 18-21.

Moreover, the experiments in examples 23-24 supplied by the authors.

0,943/of) 0.157
Table 1

Technical parameters of manufacture of the catalyst.
The amount of acrylic fiber in the solution ˜50 g/l chloride concentration of hydroxylamine 14-42 g/l
ExampleThe first stage of modificationThe second stage
The ratio of PAN/EthylenediamineThe concentration of Ethylenediamine, g/lpHTemperature processing, °Processing time, hThe processing time of a solution of salt of metal of variable valence
ValuePAN/ NH2(CH3)2NH2
12345678
120,943/0,47228,37,51001,551
260,943/of) 0.1579,437,5100-1,551
3100,943/0,0945,66 7,51001.551
460,943/of) 0.1579,4361001,551
560,943/of) 0.1579,437,51001,551
660,943/of) 0.1579,4391001,551
760,943/of) 0.1579,437,5951,551
860,943/of) 0.1579,437,51001,551
960,943/of) 0.1579,437,51051,551
1060,943/of) 0.1579,437,510011
1160,943/of) 0.1579,437,51001,551
1260,943/of) 0.1579,437,51001,61
1369,437,51001,550,5
1460,943/of) 0.1579,437,51001,551
1560,943/of) 0.1579,437,51001,552
16160,943/of) 0.1579,437,51001,552
17 (Pro totype2)101031,830
1Used catalytic material containing Dacron monofilament.
2The amount of acrylic fiber in a solution of 20 g/l In the first processing stage in the modifier solution is injected additionally: Na2CO3the number 19,76 g/l NaNO2in the amount of 20 g/l, in addition, after alkaline hydrazine powered processing is carried out, an additional treatment with an aqueous solution of alkali with the following parameters: concentration of NaOH 100 g/l, temperature 101°, 15 minutes

5
1234678
1860,943/of) 0.1579,437,51001,551
1960,943/of) 0.1579,437,51001,551
2060,943/of) 0.1579,437,51001,551
2160,943/of) 0.1579,437,51001,551
22 (prototype)2101031,830
23 (prototype)2101031,830
24 (prototype)2101031,830

Table 2

Examples of the application of catalyst
ExampleMetal ion catalystThe amount of metal ion on the catalyst, the mol/g The degree of metal removal acidic buffer solution 3, the share of unitsThe degree of catalytic conversion, %
1.2.3.4.5.
Oxidation of S', the time of the process 48 min, initial concentration of sulfide 2000 mg/l
1Ni2+0,800,29of 99.1
2Ni2+0,850,2899,5
3Ni2+0,860,30of 99.1
4Ni2+0,820,30of 99.1
5Ni2+0,850,2899,5
6Ni2+0,860,2599,6
7Ni2+0,900,2599,2
8Ni2+0,850,2899,5
9Ni2+0,800,3099,8
10Ni2+0,800,30of 99.1
11Ni2+0,850,2899,5
12N2+ 0,900,2599,6
13Ni2+0,820,27of 99.1

1.2.3.4.5.
14Ni2+0,850,2899,5
15Ni2+0,860,2899,6
16Ni2+0,850,2899,5
17 (prototype)Ni2+0,8130of 99.1
The oxidation dye acid blue 45", during the process 15 min, initial concentration of dye (20 mg/l
18Co2+1,42595
19Fe3+0,891380
20Pt4+1,03699,9
21EN4+0,96999,9
22 (prototype)Co2+1,202273,1
23 (prototype) Pt4+1,09899,8
24 (prototype)EN4+1,121099,7

3 Composition buffer: 0.04 M H3PO4, 0.04 N CH3COOH, 0.04 N HBO2*H2O, X NaOH, pH 2, the processing time 160-170 hours.

A method of obtaining a knitted material with catalytic properties, consisting of monofilaments and complex polyacrylonitrile filaments, which consists in the sequential processing of knitted fabric first hot alkaline solution containing chloride hydroxylamine in the number 14-42 g/l, and then an aqueous solution of salt of a metal of variable valence with leaching demineralized water after each treatment, characterized in that the hot alkaline solution containing chloride hydroxyamine, with added Ethylenediamine when the number of parts of polyacrylonitrile to the amount of Ethylenediamine 2-10 spend processing at pH 6-9 and a temperature of 95-105°C for 1.0 to 1.6 hours, and treatment with an aqueous solution of salts of transition metals within 0.5 to 2.0 h to the content of metal ion on the material, equal to 0.8-1.4 mmol/g



 

Same patents:

The invention relates to methods for textile surround the fibrous catalysts and can be used in chemical, petrochemical, light industry, in particular for the treatment of wastewater and gas emissions from sulphides, organic impurities, dyes

The invention relates to methods for textile surround the fibrous catalysts and can be used in chemical, petrochemical, light industry, in particular for the treatment of wastewater and gas emissions from sulphides, organic impurities, dyes

FIELD: polymer materials.

SUBSTANCE: invention relates to manufacture of ion-exchange fibers with special properties, which can be used as sorbent or as a sorbent constituent for cleaning liquid media, largely natural and waste waters. Method consists in performing alkali hydrolysis of polyacrylonitrile fiber in presence of hydrazine at elevated temperature completed by treatment of fiber with active agent causing degradation of chromophore groups of fiber. Alternatively, ion-exchange fiber is manufactured via alkali hydrolysis of polyacrylonitrile fiber in presence of hydrazine at elevated temperature, hydrolysis reaction being effected in concentrated solution of salt of alkali metal with weak acid followed by treatment of fiber with active agent as above.

EFFECT: improved characteristics of fiber at lower consumption of reagents and stabilized manufacturing process to provide ion-exchange fiber with desired number of chelating sorption groups due to appropriate balance of acid and basic groups resulting from hydrolysis.

18 cl, 5 tbl, 16 ex

FIELD: sorbents.

SUBSTANCE: invention relates to technology for preparing sorbents with fibrous structure by using waste of industrial manufacture. Method involves treatment of fibrous matrix from waste of tanning leather chips with polyelectolyte an aqueous solution obtained by alkaline hydrolysis of polyacrylonitrile or copolymer based on thereof. Prepared sorbent shows the improved capacity for extraction of different components from different aqueous media.

EFFECT: improved preparing method, improved and valuable properties of sorbent.

2 cl, 1 tbl, 2 ex

FIELD: sanitary and hygienic facilities.

SUBSTANCE: invention relates to technology of manufacturing chemisorption materials for use in municipal hygiene sphere. Method consists in treatment of chemisorption carboxyl-containing material in Na form with 0.5-1.0% aqueous acid solution, e.g. hydrochloric acid solution, at modulus (ratio of weight of chemisorption material to acid solution volume) 1:30 and treatment time 0.5-1.0 h to transfer material into H-form. Chemisorbent is then washed with softened water to pH 5-6, after which material in H-form is treated for 0.5-1.0 h with 0.5-1.0% potassium hydroxide solution, modulus 1:30. At the expiration of treatment time, material is washed with softened water to pH 5.0-6.5. Presence of three-dimensional lattice, both during treatment time of chemisorption material in the form of fibers or nonwoven material and upon use of products from this material, prevents dissolution of polymer in water or in aqueous solution of acid or potassium hydroxide. Owing to filtration, chemisorbent entraps in water heavy metal ions contained therein and water is saturated with potassium ions so that chemisorption material acquires at least 4 mmol/g of carboxyl groups in K-form.

EFFECT: optimized manufacture conditions.

2 ex

The invention relates to a method for macrosector of the anion exchange resin is a crosslinked copolymer with aminoalkenes groups, which can be used in the chemical, nutritional and microbiological industry for the purification of solutions of biologically active substances
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The invention relates to methods for ion exchange fibers based on polyacrylonitrile (PAN) and its copolymers and can be used in the extraction of metal ions Hg and Cr precise water from industrial complex salt composition
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FIELD: sanitary and hygienic facilities.

SUBSTANCE: invention relates to technology of manufacturing chemisorption materials for use in municipal hygiene sphere. Method consists in treatment of chemisorption carboxyl-containing material in Na form with 0.5-1.0% aqueous acid solution, e.g. hydrochloric acid solution, at modulus (ratio of weight of chemisorption material to acid solution volume) 1:30 and treatment time 0.5-1.0 h to transfer material into H-form. Chemisorbent is then washed with softened water to pH 5-6, after which material in H-form is treated for 0.5-1.0 h with 0.5-1.0% potassium hydroxide solution, modulus 1:30. At the expiration of treatment time, material is washed with softened water to pH 5.0-6.5. Presence of three-dimensional lattice, both during treatment time of chemisorption material in the form of fibers or nonwoven material and upon use of products from this material, prevents dissolution of polymer in water or in aqueous solution of acid or potassium hydroxide. Owing to filtration, chemisorbent entraps in water heavy metal ions contained therein and water is saturated with potassium ions so that chemisorption material acquires at least 4 mmol/g of carboxyl groups in K-form.

EFFECT: optimized manufacture conditions.

2 ex

FIELD: sorbents.

SUBSTANCE: invention relates to technology for preparing sorbents with fibrous structure by using waste of industrial manufacture. Method involves treatment of fibrous matrix from waste of tanning leather chips with polyelectolyte an aqueous solution obtained by alkaline hydrolysis of polyacrylonitrile or copolymer based on thereof. Prepared sorbent shows the improved capacity for extraction of different components from different aqueous media.

EFFECT: improved preparing method, improved and valuable properties of sorbent.

2 cl, 1 tbl, 2 ex

FIELD: polymer materials.

SUBSTANCE: invention relates to manufacture of ion-exchange fibers with special properties, which can be used as sorbent or as a sorbent constituent for cleaning liquid media, largely natural and waste waters. Method consists in performing alkali hydrolysis of polyacrylonitrile fiber in presence of hydrazine at elevated temperature completed by treatment of fiber with active agent causing degradation of chromophore groups of fiber. Alternatively, ion-exchange fiber is manufactured via alkali hydrolysis of polyacrylonitrile fiber in presence of hydrazine at elevated temperature, hydrolysis reaction being effected in concentrated solution of salt of alkali metal with weak acid followed by treatment of fiber with active agent as above.

EFFECT: improved characteristics of fiber at lower consumption of reagents and stabilized manufacturing process to provide ion-exchange fiber with desired number of chelating sorption groups due to appropriate balance of acid and basic groups resulting from hydrolysis.

18 cl, 5 tbl, 16 ex

FIELD: waste water and gas emission treatment.

SUBSTANCE: invention relates to methods for preparing catalytic materials to clean waste waters and gas emissions via removal of organic and inorganic components by liquid-phase oxidation process. Method comprises consecutive treatment of knitted cloth with hot alkali solution containing 14-42 g/L hydroxylamine chloride and an aqueous solution of variable-valence metal salts. In the first stage, treatment is carried out with modifying hydroxylamine chloride and ethylenediamine-containing solution wherein molar ratio of polyacrylonitrile unit number to ethylenediamine ranges from 2 to 10 and solution pH is 6-9. Treatment temperature is 95-105°C and treatment time 1-1.6 h. In the second stage, treatment with aqueous solution of variable-valence metal salts is carried out for 0.5 to 2 h.

EFFECT: simplified manufacture technology, reduced expenses on reagents, and reduced process time without loss in the firmness of fixation of variable-valence metal salts on cloth.

2 tbl, 21 ex

FIELD: catalysts for waste water and emission gas treatment.

SUBSTANCE: invention relates to technology of removing organic and inorganic components from waste waters and emission gases via liquid-phase oxidation, in particular, to preparing textile-supported polymer catalyst consisting of polyacrylonitrile monothreads and complex threads. Knitted cloth is treated with modifying solution at 106 to 150°C for 10 to 30 min when ratio of amounts of polyacrylonitrile units to amount of chlorine-containing hydrazine salt equal to 20-30 and the same to chlorine-containing hydroxylamine salt 10-15, pH of solution being 6-9. After that, cloth is treated with transition metal salts for 1.0-2.0 h until content of metal on catalyst achieves 0.81-1.2 mmol/g. Treatment is followed by washing with desalted water.

EFFECT: simplified catalyst preparation technology and intensified preparation process.

2 cl, 2 tbl, 30 ex

FIELD: chemical technology, resins.

SUBSTANCE: invention relates to a method for preparing polyhalide strong-basic anion-exchange resins of gel and macroporous structure designated for disinfection of water in closed ecological objects, domestic drinking water and water from non-checked sources. Polyhalide anion-exchange resins is prepared from strong-basic quaternary ammonium anion-exchange resins in chloride form by their iodination with J2 solution in KJ at stirring, thermostatic control and washing out. Iodination is carried out with triiodide solution on conditioned strong-basic anion-exchange resins in chloride form in the content of strong-basic groups 80%, not less, in the mole ratio anion-exchange resin : triiodide = 1.0:(1.1-1.5). Ready product is kept at 20-55°C additionally. Invention provides preparing polyhalide anion-exchange resins characterizing by high resource in water disinfection and in simultaneous reducing iodine release in disinfecting water in retention of high disinfecting indices.

EFFECT: improved preparing method.

1 tbl, 8 ex

Abstract // 2293061

FIELD: ION-EXCHANGE MATERIALS.

SUBSTANCE: invention relates to a process of preparing gel-like cationites for use in treatment and purification processes. Gel-like cationites are prepared by inoculating-incoming process wherein (a) aqueous suspension of microcapsulated cross-linked styrene polymer in the form of granules and containing cross-linking agent is provided as inoculating polymer; (b) inoculating polymer is left to swell in monomer mixture composed of vinyl monomer, cross-linking agent, and radical initiator, namely peracid aliphatic ester; (c) monomer mixture is polymerized in inoculating polymer; and (d)resulting copolymer is functionalized via sulfatization. Process is characterized by that, in step (a), content of cross-linking agent in cross-linked styrene copolymer amounts to 3.5-7 wt % and inoculum-to-income ratio in step (b) amounts to 1:(0.25-1.5).

EFFECT: enabled preparation of gel-like cationites having high osmotic and mechanic stabilities as well as improved oxidation resistance.

7 cl, 9 tbl, 9 ex

FIELD: chemical technology.

SUBSTANCE: invention relates to technology for preparing chemosorption materials possessing high protective properties with respect to ammonia vapors that can be used for using in filtering protective devices. Method involves impregnation of nonwoven activated fabric made of hydrocellulose fibers in an aqueous solution containing zinc chloride and nickel chloride. Also, this solution contains 1,2,3-propanetriol (glycerol) as a modifying agent taken in the amount 0.5-1.0% of the total amount of the prepared solution.

EFFECT: improved preparing method.

1 tbl, 1 ex

FIELD: chemistry.

SUBSTANCE: invention can be used for extracting metal ions, purifying waste and industrial solutions from toxic metal ions. The method of obtaining anion-exchange fibre material involves reacting activated polyacrylonitrile fibre nitron and 30-70 wt % modifying agent - mixture of diethanolamine with 10-30 wt % hexamethylenediamine in an aqueous 5% solution of dimethylformamide. Nitron is activated in a 3-6% aqueous alkaline solution for 3-5 minutes at 90-95C.

EFFECT: invention makes it easier to obtain fibrous anionite and can be used for effective purification waste water from leather industry and electroplating plants from chromium (VI) ions, and for concentrating and separating chromates from industrial solutions.

1 tbl, 4 ex

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